Communications Apparatuses and Method for Multi-Level Transmission Power Control Thereof

1. A communications apparatus, comprising: a radio module transmitting a plurality of first packets in a Bluetooth network before establishing a connection with a peer communications device, wherein a transmission power utilized for transmitting the first packets in the Bluetooth network is adjustable, so that multiple levels of transmission power are utilized for transmitting the first packets in one procedure before establishing the connection with the peer communications device in the same Bluetooth network, wherein the first packets are transmitted in response to at least a first inquiry command and a second inquiry command; and a power amplifier utilizing a first transmission power to transmit the first packets in response to the first inquiry command and uses a second transmission power to transmit the first packets in response to the second inquiry command, wherein the first packets are identity packets transmitted in compliance with a Bluetooth protocol for establishing an Asynchronous Connection-Oriented Link (ACL) connection, wherein the first transmission power and the second transmission power have different levels, and wherein the radio module uses different levels of transmission power to transmit the first packets in different time slots.

2. The communications apparatus as claimed in claim 1 , wherein the first packets are utilized to search for the peer communications device in the Bluetooth network or set up a connection with the peer communications device.

3. A communications apparatus, comprising: a radio module transmitting a plurality of first packets in a Bluetooth network before establishing a connection with a peer communications device, wherein a transmission power utilized for transmitting the first packets in the Bluetooth network is adjustable, so that multiple levels of transmission power are utilized for transmitting the first packets in one procedure before establishing the connection with the peer communications device in the same Bluetooth network, wherein the first packets are transmitted in response to at least a first inquiry command and a second inquiry command; and a power amplifier utilizing a first transmission power to transmit the first packets in response to the first inquiry command and uses a second transmission power to transmit the first packets in response to the second inquiry command, wherein the first packets are advertising packets transmitted in compliance with a Bluetooth low energy protocol for broadcasting or establishing a Bluetooth low energy connection, wherein the first transmission power and the second transmission power have different levels, and wherein the radio module uses different levels of transmission power to transmit the first packets in different time slots.

4. The communications apparatus as claimed in claim 1 , wherein the radio module uses different levels of transmission power to transmit the first packets at different periods.

5. The communications apparatus as claimed in claim 1 , wherein the radio module uses different levels of transmission power to transmit different first packets.

6. A method for multi-level transmission power control of a communications apparatus, comprising: generating a power control signal to control transmission power utilized for transmitting a plurality of first packets in a Bluetooth network; in response to the power control signal, using multiple levels of transmission power to transmit the first packets in a procedure, wherein the first packets are transmitted in the procedure for searching for or paging a peer communications device in the same Bluetooth network or broadcasting advertisements of the communications apparatus in the same Bluetooth network; receiving a second packet from the peer communications device after one of the first packets has been received by the peer communications device; recording the level of the transmission power utilized for transmitting the received first packet in response to reception of the second packet; and using a transmission power not less than the recorded transmission power as the transmission power for transmitting a following packet in the same Bluetooth network to the peer communications device, wherein the first packets are transmitted in response to at least a first inquiry command and a second inquiry command, and the step of using multiple levels of transmission power to transmit the first packets further comprises: using a first transmission power to transmit the first packets in response to the first inquiry command and using a second transmission power to transmit the first packets in response to the second inquiry command, wherein the first packets are identity packets transmitted in compliance with a Bluetooth protocol for establishing an Asynchronous Connection-Oriented Link (ACL) connection, wherein the first transmission power and the second transmission power have different levels, and wherein using multiple levels of transmission power to transmit the first packets further comprises using different levels of transmission power to transmit the first packets in different time slots.

7. The method as claimed in claim 6 , wherein the step of using multiple levels of transmission power to transmit the first packets further comprises: using different levels of transmission power to transmit the first packets at different periods.

8. The method as claimed in claim 6 , wherein the step of using multiple levels of transmission power to transmit the first packets further comprises: using different levels of transmission power to transmit different first packets.

9. The method as claimed in claim 6 , wherein when the first packets are transmitted for paging the peer communications device or broadcasting the advertisement of the communications apparatus, the following packet is transmitted to the peer communications device to establish a connection and the recorded transmission power is further used to be the initial transmission power of the connection.

10. The method as claimed in claim 6 , wherein when the first packets are transmitted for searching the peer communications device, the following packet is a Frequency Hop Synchronization (FHS) packet and the recorded transmission power is further used for paging the peer communications device.

11. A method for multi-level transmission power control of a communications apparatus, comprising: generating a power control signal to control transmission power utilized for transmitting a plurality of first packets in a Bluetooth network; in response to the power control signal, using multiple levels of transmission power to transmit the first packets in a procedure, wherein the first packets are transmitted in the procedure for searching for or paging a peer communications device in the same Bluetooth network or broadcasting advertisements of the communications apparatus in the same Bluetooth network; receiving a second packet from the peer communications device after one of the first packets has been received by the peer communications device; recording the level of the transmission power utilized for transmitting the received first packet in response to reception of the second packet; and using a transmission power not less than the recorded transmission power as the transmission power for transmitting a following packet in the same Bluetooth network to the peer communications device, wherein the first packets are transmitted in response to at least a first inquiry command and a second inquiry command, and the step of using multiple levels of transmission power to transmit the first packets further comprises: using a first transmission power to transmit the first packets in response to the first inquiry command and using a second transmission power to transmit the first packets in response to the second inquiry command, wherein the first packets are advertising packets transmitted in compliance with a Bluetooth low energy protocol for broadcasting or establishing a Bluetooth low energy connection, wherein the first transmission power and the second transmission power have different levels, wherein the first transmission power and the second transmission power have different levels, and wherein using multiple levels of transmission power to transmit the first packets further comprises using different levels of transmission power to transmit the first packets in different time slots.